Check valve



SPt' 2, 1952A K. voN KoKERlTz ET Al. 2,6095175 CHECK-VALVE 2 SHEETS SHEET l Filed May 2, 1945 d f.. hwk S www. m www m V 0 mwa w mf A Hum

Sept 2, 1952 K. voN KoKERlTz ET AL 2,609,175

CHECK-VALVE Filed May 2, 1945 2 SHEETS-SHEET 2 ATTORNEYS.

Patented sept. 2, 1,952

OFFICE CHECK VALVEA Y Karl von Kokeritz, Staten Island, and Raymond ILBIackford, Long Beach, N. Y.,.and Bernard L. Schwaller,` Wayne, Pa., assignors to Durabla Manufacturingv Company,-New York, N. Y., a lcorporation of New York i; .w1

Application May 2, 1945,f s"eria.1Np. 591,532

to remove when needing repair or YreplacementV Without distorting or dismantling the immedi-v ately co-nnected conduit or pipe length.

The primary object of this invention is to pro'- vide a novel form of check-valve which lis capable of quick and/or easy placement orremoval with all of its components, as a unit, without-'dis-` connecting or removing any' length of the' line proper in which it is interposed.

Another object is to furnish an improved check- Valve which can be quickly removed and replaced by the simple expedient of loosening the conventional means normally holding together the :confronting end iianges of aligned conduit or pipe. 5 1

A further object of this invention is to provide' a straight-line ow'type of check-valve,prefer ably constructed asa Welded assembly, whereby,

the cost o-f production of such valve is considerably reduced; said novel check-valve being of superior quality incidental to the inclusionl therein of solid, homogeneous drawn and forged metal parts, as contrasted with the prior use of castings which are not infrequently porous and deformed incidental to uneven shrinkage, and so forth.

A still further object is the provision of a no-leak check-valve comprising but few parts and constituting, when assembled; a self-contained unit which can be fitted in active position, or removed, with a minimum expenditure of time and labor.

While the foregoing definitions are indicative in a general way of the aims of this invention, other objects with ancillary advantages will be evident to those skilled in the art upon a full understanding of the construction, arrangement and operation of the means hereinafter fully dis.- closed; but it will also be appreciated that this invention is susceptible of other embodiments or structurally modified forms coming equally within the terms and scope of the concluding claims. i

In the accompanying drawings: f

Fig. 1 is a central longitudinal section through a pipe line connection in which is interposed a` preferred embodiment of the novel check-valve constructed in accordance with this invention.

an assembled unit.

3 Claims. (Cl. 251-144) Fig. 3 is appart sectional fragmentary perspective view of a modified form of seat component, the same being hereinafter full explained.

Fig. 4 isa sectional view similar to Fig. 1 showing a modied form of check-valve, and

Fig. 5 is a plan view of the check-valve shown in Fig. v4. v

In the following detailed description of the embodiments of this invention shown by the above identiiied drawings, specific terms will be employed forthe sake of clarity, but it is to be understood that such terms are used in a descriptive sense and not for purposes of limitation; each suchy term being intended to include all technical equivalents which cooperate in a similar manner to accomplish an analogous objective.

Referringmore in detail rst to Figs. 1 and 2, the reference numerals 6, 1 respectively designate inlet and discharge metal pipe ends, the formerof which 6 is iitted with a socket-type flange 8 appropriately secured thereto by a surrounding weld 9, whereas the latter 1 has a similar flange IB likewise integrated thereto by a corresponding weld II. Both of the anges `8 and Iii are provided with circumferentially spaced apertures I2 for passage of clamp bolts I3,

whereby connection of the respective pipe ends is effected, as later on again referred to.

Each flange 8, Ill is formed with a socket I4 of a diameter to snugly t the end portion of the respective pipe 6, 1; a bore I5 and a flare I 6; as well as a concentric groove I1 in the confronting faces for reception of the respective ends of the cylindrical wall I8 of the check-valve comprehensively designated I9, With'interposition of suitable sealing gaskets 2U.

The cylindrical wall I8 of the check-Valve I9 is, preferably, severed from seamless steel tubing of appropriate diameter and thickness, and cut to the desired length for seating in the line connection ilange-grooves I1, as readily understood froxnFig. 1. Circumferentially spaced around the bore of the check-valve wall or cage I8 are a series of radial and longitudinally directed guide elements 2| conveniently although not essentially cut to the desired length from steel bar or similar stock, and said guide elements 2I are xed to the wall I8 by upper and lower welds 22, 23. The valve wall I8 is further iitted with a concentric spacer-ring 24 co-planar with the upper ends of the guide elements 2 I and secured thereto by welds 25`; and said ring 24, in turn, affording support for a tubular section stop-means 26 which is permanently attached in position by welds 21, all V*as readily seen and appreciated from Figs. 1 and 2.

The lower end of the check-valve or cage wall I8 is conveniently counter-bored and screwthreaded at 28 for reception of a circumferentially threaded annular member 29, of seamless steel, embodying a seat 39, and said annular member 29A is recessed at 3| so as to provide a surrounding section or lip 32 which, vwhen the member 29 is fitted in position, forms an extension of the wall I8 for seating in the adjoining groove I1 of the flange 8, all as clearly shown in Fig. 1. At this juncture particular attention is directed to the fact that the lower gasket 29 not only covers the end of the cylindrical wall I8 but also the threadedly engaged annular end of the ported seat member 29, whereby the screwthreaded joint as well as both of said parts are positively sealed against leakage from within the valve, as well as surrounding atmospheric action from without. In addition the annularA member 29 may be provided with socket holes 33 for application of a suitable tool whereby said member can be easily inserted or removedin an obvious manner. Coactive with the seat 30 aforesaid is a valve disc34, preferably of the undulate crosssection shownand `having a surrounding lip 35 in which seats the lower end of a coil-spring 36 in compression. The upper end of coil-spring 36 preferably engages in a concentric groove 31, provided for the purpose in the underside of the spacer-ring 24 hereinbefore described.

At this juncture it is to be noted that while the annular orseat member Y29 has been shown and described as having screw-thread engagement in the valve cage I8 for ease in assembly of the valve IS, or removal, it is to be distinctly understood such formy of connection is not limitative; inasmuch as the seat member 29 may be made a sliding or a drive nt, `or even a taper-fit as found desirable or expedient. Furthermore, the

seat-member may be of the generally termed L ported typel 38 shown in-Fig. 3, so as to provide a center support 39 for the valve disc 34 as indicated in dot-and-dashoutline in Fig. 1.

.Referring now to the modied form of this invention shown by Figs. 4 and 5 of the drawings, all' parts having equivalents in the preceding description will-be correspondingly designated by like reference characters-in order to obviate unnecessary repetitive explanation. It will be observed, however, that the previously described pipe coupling connections are substituted by what are known in the art as welding neck-anges 40, tothe reduced ends 4l whereof the pipe ends 6, 1 are abuttingly seam-welded at 42. The radial guide'elements 2l in this form of the invention are conveniently secured to the cage wall by lower and upper abutment welds 23, l43 respectively; While the spacer-ring 24 is dispensed with and use made of a diameter bar 44, integrated on top of opposed elements 2| by welds 45; and to said bar 44 the stop means 26 is iixedly attached by welds k46, all as readily understandable by those conversant'with the art. A still further diierence in this form of the invention is concerned with the provision of a shallow recess 41 in each of the confronting faces of the neck-flanges 4D, into the upper of which the cage wall I8 seats with interposition of a suitable sealing gasket 20; whereas the lower end of said cage walls seats on a shouldered reduction 48 and gasket 2IJ circumferentially of the annular seat member 29; while the latter seats in the recess 41 of the lower neck-ange 4i! with an intervening gasket 49 whereby the cheek-valve I9 is rendered much more easy of assembly and removal for purposes of repair or replacement.

In the operation of the improved check-valves I9 of this invention it will be readily understood that as the liquid or vapor enters by way of the pipe 6, as indicated by the arrows in Figs. 1 and 4, it exerts pressure againstfthe underside of the valve disc 34, and lifts the latter from its seat 30 in opposition to the spring 36 in compression, thereby opening the valve I9 for passage of the liquid or vapor therethrough to the pipe 1 with an almost unrestricted straight-line teardrop-iiow action between the radial guide elements 2 I, and thence onward'through said pipe 1 to discharge, or otherwise. Upon cessation of the flow the valve disc 34 will automatically close to the seat V30 aided by the reactive force of the spring 36 and any back-pressure in the pipe line 1.

From the foregoing it will be apparent that the force of the spring 36. its gauge as well as that of the valve disc 34, can be varied to suit differing service conditions without interfering with the sensitivity or responsiveness required by specific service needs. Furthermore the valves I9 may be made of numerous sizes for use in pipe lines of diierent diameters or wherever a checkvalve is required; while it will be self-evident that suchy valves of the smaller sizes may be arranged in group formation with considerable advantage over a single large unit; while extensive tests have proven that the valve discs 34 when not activated sit tight to the seats 3D, 39; or they will not cant and cause leakage thcrepast. In other words, check-valves of the hereinbefore typified species have proven to be positive in action under diverse test conditions, while they are more durable and less liable to get out of order than analogous types of such valves; whereas the manner of gasketing the valve by the elements 20 and 49 effectively seals the valve body or cage I8 as Well as the port through the annular seat member 29, against leakage or atmospheric action.

Having thus. described our invention, we claim: 1. A check valve for a iuid comprising a housing having a substantially cylindrical inner face, said housing having an inlet and an outlet for iuid, `a ported valve seat base mounted in said housing adjacent to the inlet thereof, a valve seat on said base, a plurality of spaced-apart bar elements each extending longitudinally along the inner face of said housing and forming longitudinally-extending channels therebetween, a ring fixed to the inner faces of said bar elements near the outlet of said housing, `the outer face of said ring'coacting with the inner face of said housing to form passages near the ends of said channels through which iluid may pass, a stop element having a cylindrical surface xed within said ring, a valve disc having a curved outer portion movable longitudinally in said housing intermediate said stop element and said valve seat, and reactive means in the form of a helical spring mounted in said housing continuously urging said disc toward said seat, said disc having a diameter substantially equal to the diameter of said ring whereby the outer edge of the valve disc is adjacent to the inner edges of said bar elements and the inflowing uid is thereby caused to iiow through the longitudinally extending channels between said spaced-apart bar elements, and said helical spring being substantially in alignment with said valve seat and with the curved louter portion of said valve disc.

2. The check valve dened in claim 1 wherein said stop element is in the form of a tube extending longitudinally within said helical spring. 3. The check valve dened in claim 1 wherein said housing is counterbored, and said valve seat is removably attachable within said counterbore.

KARL voN KOKERITZ. RAYMOND H. BLACKFORD. BERNARD L. SCHWALLER.

REFERENCES CITED The following references are of record in the le of this patentar UNITED STATES PATENTS Name Date Messinger May 22, 1888 Number Number 

